Oil-burner.



Patented Jan. 1a,. 910,

J. A. MAHR. OIL BURNER. Arrmonlon 'rILnn JULY. 14, 1909.

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UNITED erm ne PATENT ormon.

' JULIUS A. MAHR, OF MINNEAPOLIS, MINNESOTA.

' OIL-BURNER.-

Specification of Letters Patent.

' Patented J an. 11,1910.

Application filedJuly 14, 1909. Serial No. 507,531.

T all whom "it may concern:

Be it known that I, JULIUS-YA. MAHR, a

citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota,'have invented certain new and useful Improvements in Oil-Burners; and I do hereby declare the following to be a full, clear, and exact description of the nvention, such as will enable others skilled in the art to which it appertains to make and Y I use the same.

My invention has for its object to provide an improved oil burner especially adapted for use in burning crude oil, and to' this end it consists of the novel devices and combina-' tions of devices hereinafter described and defined in the claims. v

Fig. 1; and Fig. 4 :'IS a plan view of the burner, showing a modified form of the nozzle applied thereto.

The main body portion of the burner is in the form of va shell 1, which constitutes the A primary combustion chamber and is open at its outer end. Cast integral with the discharge end of this shell 1, and spaced apart therefrom to form an air intake passage 2, is a nozzle coupling 3 which, as shown, is connected to the said shell 1 by integrally cast radialfins 4. A valve casing 5 s screwed into the other end of the shell'l and this valve casing is formed with an oil chamber.-6 and with an air chamber 7. The air chamber 7 nearly but not quite surrounds the oil chamber 6 and the said chambers 6 and 7 are connected to the delivery ends of oil and air supply pipes 8 and 9, respectively. The valve casing 5, as'shown, is provided with an integrally cast hollow discharge nipple 10 that leads into the primary combustion.

chamber formedwithin the shell 1, directly from the oil chamber 6. The passage through this oil discharge nipple 10 is adapted to be opened and closed by a needle valve 11, the

stem of which has threaded engagement with a stufling box sleeve 12 which, as. shown, 1s screwed into the outer end of the valve casing 5. The extended end of'the valve stem 11 is connected to an operating rod 13 which I exactly the right extends to a suitable point from which it is desired to operate the valve. An air discharge nipple 14 surrounds the oil discharge nipple 10 and, as shown, is screwed into the inner end of the valve casing 5. With this arrangement, the oil delivered by the nipple 10 will be taken up by the surrounding blast of air delivered by the nipple 14 and'will be thrown into a very fine spray within the primary combustion chamber, also the initial combustion will take place within this primary' combustion chamber, to-wit, within the shell 1.

A large discharge nozzle 15 is connected, preferably by threaded engagement, to the outer end of the coupling nozzle In the construction shownin Fig. 1, this discharge,

nozzle'l5 has a straight axis, but is contracted toward its rear end. In the construction shown in Fig. 1, which is otherwise like that above described, the discharge nozzle 15 is curved, so that it delivers at one side. In'

either instance, the blast of air delivered intov the primary combustion chamber from the nipple 14, will produce a strong. force draft which will draw a large amount of air into the nozzle 15 or 15 so that increased combustion will take placewithin the said nozzle,

due to the additional supply of oxygen afforded by the auxiliary current of air drawn in through the. annular air intake passage 2. The flame will, of course, be discharged from the said nozzle. p i

To regulate the amount of air taken in through the. annular auxiliary air intake passage 2, a valve or gate in the form of a collar 16 is mounted for .lateral movements on the nozzle coupling 3 and preferably has threaded engagement therewith. As is obvious, when the collar 16 is screwed rear-' ward into engagement with the shell 1, the auxiliary supply of air will be entirely out off, while the'said passage 2 may be opened up to any desired extent by'adjustments of the said collar away from the shell 1 and toward the nozzle 15. By such adjustments,

amount of air may be supplied which is required to perfect the best combustion of oil.

lVhile especially designed for burning crude oil, the burner may be used for burning very different kinds of hydrocarbons. Oil or air will preferably be delivered to the burner through the respective pipes 8 and 9 from suitable sources of'supply under the same pressure.

- the opposite ends ofthe cylinder under theward the left against the tension of said flooding the air discharge nipp To prevent dripping of oil after the burner has been turned out of action and the further supply of oil or air thereto are out off, I provide a novel device which constitutes one feature of this invent-ion. This device 'is preferably constructed and involves a cylinder 17 to the opposite ends of which the pipes 8 and-9 are connected, and

to the corresponding ends of said cylinder.

'oil and air supply pipes 8 and 9 are connected. These supply pipes 8 and 9 areprovided, respectively, w1th valves 18 and 19. Working within the cylinder His a piston 20, the stem 21 of which, as shown in Fig. 1, works through the le'fthand head of the cylinder 17. A stop projection 22 on the righthand head of the cylinder limits the movement of the piston toward the right and a hub 23 on the lefthand head of the cylinder limits the movements of the said piston toward the left. A'light coiled spring I 24, which surrounds the piston stem 21, yieldlngly presses the piston 20 toward the right. This spring 24 is of such light ten- 1 sion thatwhen oil and air are turned into same pressure, the piston will be moved tospring, due to the greater efiective area of the piston on the righthand side than on the left, it being, of course, understood that the diameter of the piston rod 21 is subtracted" from the total area of the piston on its lefthand side. Hence, when the burner is in action, the piston 21 will be as far toward: the left as permitted by the hub 23, but can- When, how-1 not close the oilpipe 8 8 ever, the air and oil are cut ofi by closing the valves 18 and 19, the spring 24: will move the piston 20 back to its extreme position toward the right, thereby causing the said piston to, draw back into the cylinder oil:

which has been delivered into the .pipe 8, chamber 6 and discharge nipple 10. This prevents oil, after the burner has been turned out of action, from dri ping and ie 14 and chamber 7 or from running into the primary combustion chamber. From a broad point of view, a diaphragm and casing might be used instead of the cylinder and piston,

although the cylinder and piston' are preferred for several reasons, but chiefly for the reason of their large oil containing capacity.

' The improved burner above described has been put into actual use and found highly efficient for the purposes had in view.

What I claim is: 1. In an oil burner, the combination with a casing constituting a primary combustion chamber, of asecondary combustion chamber connected to the delivery end of said casing, an'approximately annular'air intake 7 passage between the two combustion cham- 'bers, means for delivering both oil and air into the receiving end of said primary combustion .rc'hamber and an annular valve mounted on said. combustion chambers for longitudinal movement for opening and closlng said air intake passage, substantially as described. I

- 2. In an oil burner, the combination with a shell constituting a primary combustion chamber, of means for delivering oil and airinto the. receiving end of said shell, an an nular nozzle coupling connected to the .de-

livery end of said shell but spaced apart therefrom to afford an annular air intake passage, a collar mounted for lateral movements on said nozzle coupling to open and close said auxiliary air intake passage, and

a discharge nozzle connectedto said nozzle coupling and constituting a secondary combustion'chamber, substantially as described.

3. In an oil burning device, the combination with oil and air delivery conduits, of a cylinder through which both the air and oil JULIUS. A. Witnesses:

. ALICE V. Swanson, HARRY D. KILGORE. 

